In this paper, we aim to demonstrate the feasibility of upgrading the CELEC EP 40 channel, 400 Gb/s, NRZ, DWDM ring, using PAM-4 modulation with the same 40 channels transmitting each at 40 Gb/s, for achieving a total capacity of 1.6 Tb/s. To overcome the problem related to the dispersion sensitivity of PAM-4 in long-distance links, we employed a dual technique of compensation, in the optical and electrical domain, based on dispersion-compensating fibers and in electrical pre-distortion of the PAM-4 signal. Simulation results show that the upgrade to 1.6 Tb/s is feasible using low-complexity changes in the current infrastructure. In the shorter links of the ring, it is enough the use of optical dispersion compensation, and a BER = 10-9 is achievable with an optical received power of about −19 dBm, whilst in the longest links, the electronic pre-distortion is mandatory for avoiding a penalization of about 3 dB for getting the same goal BER if the pre-distortion is not used. We validated the simulations with a comparison with experimental results for the longest link, 165 km, of the ring. Experimental and simulations results show nearly de same values of non-pre-distortion penalty and receiver sensitivity, for achieving the same goal BER.
|Title of host publication||Information and Communication Technologies - 8th Conference, TICEC 2020, Proceedings|
|Editors||Germania Rodriguez Morales, Efraín R. Fonseca C., Juan Pablo Salgado, Pablo Pérez-Gosende, Marcos Orellana Cordero, Santiago Berrezueta|
|Publisher||Springer Science and Business Media Deutschland GmbH|
|Number of pages||11|
|State||Published - 2020|
|Event||8th Conference on Information and Communication Technologies of Ecuador, TICEC 2020 - Guayaquil, Ecuador|
Duration: 25 Nov 2020 → 27 Nov 2020
|Name||Communications in Computer and Information Science|
|Conference||8th Conference on Information and Communication Technologies of Ecuador, TICEC 2020|
|Period||25/11/20 → 27/11/20|
Bibliographical noteFunding Information:
Acknowledgment. A. Veloz and G. Arévalo thank the funding for making this research given by the Telecommunications Research Group (GIETEC) of Universidad Politécnica Salesiana.
Funded by the Telecommunications Research Group (GIETEC) of Universidad Politécnica Salesiana and supported by the Engineering Faculty of Pontificia Universidad Católica del Ecuador.
A. Veloz and G. Ar?valo thank the funding for making this research given by the Telecommunications Research Group (GIETEC) of Universidad Polit?cnica Salesiana.
© 2020, Springer Nature Switzerland AG.
- Dispersion compensation
- Gray coding
- Optical ring